In the manufacture of nitric acid by the oxidation of ammonia, the first product is nitric oxide, which is then oxidized to nitrogen dioxide. From the standard reaction enthalpies,

calculate the standard reaction enthalpy for the oxidation of nitric oxide to nitrogen dioxide:

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N₂(g) + O₂(g) N₂(g) + 2 O₂(g) 2 NO(g) 2 NO₂(g) AH° = AH° = +180.5 kJ +66.4 kJ